Today we are releasing a new browser extension for Chrome and Firefox named Privacy Pass. Privacy Pass uses privacy-preserving cryptography to allow users to authenticate to services without compromising their anonymity. This is joint work with George Tankersley, Ian Goldberg, Nick Sullivan and Filippo Valsorda.

Enabling anonymous access to the web with privacy-preserving cryptography
Cloudflare supports Privacy Pass, a recently-announced privacy-preserving protocol developed in collaboration with researchers from Royal Holloway and the University of Waterloo. Privacy Pass leverages an idea from cryptography — zero-knowledge proofs — to let users prove their identity across multiple sites anonymously without enabling tracking. Users can now use the Privacy Pass browser extension to reduce the number of challenge pages presented by Cloudflare. We are happy to support this protocol and believe that it will help improve the browsing experience for some of the Internet’s least privileged users.